Although there are other possibilities, you can't go wrong if you use nor only after the word neither: instead of "Keats did not write novels nor essays," use either "Keats did not write novels or essays" or "Keats wrote neither novels nor essays." (You can, however, say "Keats did not write novels, nor did he write essays.")"

If one wanted to emphasize the interminable falling of the snow, the sentence you quote is better written: